2. atoms, ions and compounds

Question 1

isotopes

Answer 1

atoms of the same element with different number of neutrons

Question 2

relative atomic mass

Answer 2

the weighted mean mass of an atom of an element relative to 1/12th of the mas of an atom of carbon-12

Question 3

relative isotopic mass

Answer 3

the mass of an isotope relative to 1/12th of the several isotopes relative to the mass of carbon-12